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參數資料
| 型號： | LC74725M |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDSO24 |
| 封裝： | 0.375 INCH, PLASTIC, MFP-24 |
| 文件頁數： | 2/16頁 |
| 文件大小： | 330K |
| 代理商： | LC74725M |
No. 5213-10/16
LC74725, 74725M
③ COMMAND2 (Vertical display start position and vertical character size setup command)
First byte
Second byte
④ COMMAND3 (Horizontal display start position and horizontal character size setup command)
First byte
Register content
DA0 to DA7
Register name
State
Function
Note
7—
0
Second byte identification bit
6FS
0
Crystal oscillator frequency: 2fsc
1
Crystal oscillator frequency: 4fsc
5
VP5
0
(MSB)
1
4
VP4
0
1
3
VP3
0
1
2
VP2
0
1
VP1
0
1
0
VP0
0
(LSB)
1
The vertical display start position is set
by the 6 bits VP0 to VP5.
The weight of bit 1 is 2H.
If VS is the vertical display start position then:
5
VS = H × (2Σ 2nVPn)
n = 0
H: the horizontal synchronization pulse period
Register content
DA0 to DA7
Register name
State
Function
Note
7—
1
6—
0
Command 2 identification code
5—
1
Set the vertical display start position and vertical character size.
4—
0
3—
0
2
VS20
0
1H per dot
Second line vertical character size
1
2H per dot
1—
0
VS10
0
1H per dot
First line vertical character size
1
2H per dot
Register content
DA0 to DA7
Register name
State
Function
Note
7—
1
6—
0
Command 3 identification code
5—
1
Set the horizontal display start position and horizontal
4—
1
character size.
3
EGP
0
Correction: off
Border specification when the horizontal
1
Correction: on
double character size is used
2
HS20
01 Tc per dot
Second line horizontal character size
12 Tc per dot
1—
0
HS10
01 Tc per dot
First line horizontal character size
12 Tc per dot
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